Gtjilherme sombra



G. SOMBRA.

ADJUSTABLE CHAIR.

APPLICATION FILED APR.14, |911.

1.324,01 3. Patented Dee. 2,1919.

@uli/verme S0/12b@ JFmfLfna GUILHERME SOMBRA, OF BIO DE JANERO, BRAZIL.

ADJUSTABLE CHAIR.

Lezama'.

Y speeication of Letters ratent., i Y[Patented Dec. 2, 1919.Y

Application led April 14, 1917. Serial 310.162,21.

To all whom z' may concern: n

Be it known that I, GUILHERME SOMBRA, citizen of Brazil, and resident ofRio de J aneiro, Brazil, have invented certain new and usefulImprovements in Adjustable Chairs, of which the following is aspecification.

This invention relates to adjustable chairs particularly adapted for useLin connection with medical, dental or surgical operations, and has forits chief object to provide a chair of this'character which may beeasily erected or collapsed, thus providing an efficient portableoperating chair.

A further object isto provide means for effecting the desiredladjustment of the chair A when the same is occupied, and which willincidentally serve to erect or collapse the chair.

ln order that the said invention may be clearly understood and readilyca rried into effect, the same will now be more fully de# scribed withreference to the accompanying drawings, in which:

Figure 1 is an elevation of a chair embodying the present invention. Y

Fig. 2 is a plan view thereof.

Figs. 3 and 4t are perspective views of details thereof.

Referring to the drawings, A and B lrepresent the back and front legportions, respectively, which are pivotally connected at X by means ofpivot pins 1. The back leg portion A consists of leg members 2 and 3connected at their lower ends by means of a cross beam 4;. The upper endof portion A is connected to a frame C formed of members or beams 5, 6,7 and 8. The front leg portion B comprises leg members 9 and 10connected at their lower ends by means of a cross beam 11 and at theirupper ends by a cross beam 12.

The cross beam 8 is provided with a threaded shaft 13 which is adaptedto engage with an internally threaded bushing 18 mounted on thecross-beam 12. A beveled gear 14: is provided at one end of' said shaftand engages with a bevel gear 15, mounted on a transversely arrangedshaft 16, passing through the member 5 of the frame C. Shaft 16 isadapted to be rotated by means of a handle or crank 17 arranged at theVouter end thereof. It will be seen that when the crank 17 is operated,the threaded shaft 13 will be rotated through the intervention of thebeveled gears 14 andy 15 so as to bodily displace the beam 12 on theframe C owing to the threaded connec` tions between said rod and thebushing. ln this manner the relative positions of leg portions A and Bare changed and theywill turn on the pivots 1. Movably affixed to theleg portion B at 19 are members 2O and 2l forming a foot rest E, saidmembers bel ing connected to leg portion A by rmeans of members 22 and23 so arranged thatthe raising or lowering of the chair will cause thefoot rest'to be turned toward or away from the chair body.

The chair may be provided in the usual manner with detachable arm rests,cushions and instrument holders. D is the back or head rest of the chairand is suitably hinged to the frame C so as to be capable of angularmovement or adjustment when the supporting struts thereof areset'in oneyor other of a series of notchesformed in the side mem bers of theframe' C. l

It will be readily seen that the rotation of the crank or handle 1 7will effect the simultaneous movement ofthe leg portions A and B of thechair andthe foot rest E thereof. The adjustment of these parts may bereadily effected when-the seat is occupied so that surgical or dentaloperations may be considerably facilitated. v

What l claim is: `f

1. A collapsible or portable chair comprising pivotally connectedcrossed legs, a seat frame supported by the upper ends of said crossedlegs, a foot rest pivotally connected to one ofthe legs on the side ofthe common pivot thereof remote from the seat frame and means forvarying the degree of separation of the upperlend of said crossed legstoeffect the vertical adjustment of the seat frame and foot rest, whilemaintaining the distance of separation thereof substantially constant. y

2. A collapsible or portable chair comprising 2pivotally connected legs,a seat frame supported by the upper ends of said crossed legs, a movablecross beam on said seat frame, a pivotal connection between the upperend of one of said crossed legs and the movable `cross beam, a pivotalconnection between the upper end of the other crossed leg and the seatframe, a foot rest pivotally connected to the leg on the side of thecommon pivot thereof remote from the seat frame, and means fordisplacing the movable cross beam of the frame to vary the degree ofseparation of the upper ends of Said crossed legs to effect the verticaladjustment oi the seat frame and toot rest, While maintaining :thedistaneeof .separation thereof substantially constant.

3. A collapsible or portable chair, comprising pivotally connected legs,a seat trainesiipported y:by the Lupper ends .of `said.

crossed legs', a foot restipivotally,connected to the leg on the side ofthe eoinmon pivot .thereofremiote from the seat frame, a moy-v ablecross beam oii said seat frame, La Vscrewed bushing carried by saidcross beam,

a screwed red passing ithrough vsaid threaded bushing-,and gearingorrot-ating said screwed rod to effect/bodily displacement of the .crossbeani oic the seat traine, so as toV maintain the distance of separationof said seat frame and foot rest substantially cen-k stant. l Acollapsible .erf'portable chair, comprising a seat frame, aniiCl-Jviivstivble back carried by saidl seat frame crossed leg :por-

tions. .pivoted together and siip poirting said seat `traine, a movablecross beam on Sad seat traine,l a pivotal connection between l theYripper end of one 'of the leg portions andthe movable cross beam, a:toot` rest pivotally connected y to said 'leg portion, vand means 'fordisplacing `the movable cross beam of the seat frame tofeifect Verticaladjustment of Ythe seat .frame and foot rest, while maintaining thedistance of .separation thereof substantially constant.

A collapsibleoruportable chair, coinprising a seat frame, an adjiistableback carried by `said yseat 4trainen .ClTOssed .leg portions -pivotedtogether and siipporting: said seat frame, va movablefeross beam onvsaid seat frame, a pivotal connection between the upper end of one ofthe leg portions and ythe cross beam, a :foot-rest pivotally` connectedto sad leg portion, an internally threaded bushing carried by said crossbeam, a screwed rod engaging with4 said threaded Ibushing, a shaftarranged iat iight `tions :piiote'd together and 'supporting said seat`frame, a nioiable cross (beam .on said seat frame, .a pivetal'connection between the upper end "efone Oi' the leg Eportionsand:theeross beam, a. fo Ot Krest piVQti-ally eennected vto said legportion, anni: earr'iedY by said cross bea-n1, afserewed rod'nldapted toengage .with said screwed mit, sliaittarrangedat right angles to saidVscrewed shaft,

beveled gearing between .said vshafts and a crank the end. ofgoiieofsaidffshafts `iter operating the sanie'fto feeet the displacement of thenioyable" erossbeamjoithe seat framefso as to' maintain,t-hedistaneeoifseparation of said seat `traine and toot iestsnbstantially constant.

Signed at ARio ,de (Janeiro Brazil. 'this A 29th kday `of lylay, AA.ylll/ 9:17.Y Y Y i eiiiiiiinniinsoinsna.

